120. Convert Integer to Hex String Without sprintf or itoa functions

#include <stdio.h>
#include <stdint.h>

void print_hex(uint16_t num) {
    // Your logic here
    if (num==0) {
        printf("0");
        return; 
    }
    char hex_digits[17] = "0123456789ABCDEF";
    char buffer[5]; 
    int i=0; 
    while (num>0) {
        buffer[i++] = hex_digits[num%16]; 
        num/=16; 
    }
    for (int j=i-1; j>=0; j--) {
        putchar(buffer[j]);
    }
}

int main() {
    uint16_t num;
    scanf("%hu", &num);
    print_hex(num);
    return 0;
}